Hypodermic syringe assembly



Feb. 18, 1958 J. SCIURBA I 2,823,675

HYPODERMIC SYRINGE ASSEMBLY Filed Nov. 4, 1957 2 Sheets-Sheet 1INVENTOR.

JOSEPH SCH/H514 ATTORNEY Feb. 18, 1958 J. SCIURBA 2,823,675

HYPODERMIC SYRIWNGE ASSEMBLY Filed Nov. 4, 1957 2 Sheets-Sheet 2 I I BY:JOSEPH SC/URBA United States Patent HYPODERMIC SYRINGE ASSEMBLY JosephSciurba, Rutherford, N. J.

Application November 4, 1957, Serial No. 694,383

12 Claims. (Cl. 128-218) This invention relates to an improvement in:ahypodermicsyringe, and its principal. object is to-provide means forquickly assembling and disassembling the major combarrel of a hypodermicsyringe and. to the top of the mating. plunger. To avoid the necessarymachining operations and facilitate the. assembly of these parts haslong been an. objective in this field of manufacture. By my inventionthe use of interlocking parts eliminates the need for threadedconnections andenables a more rapid assembly or interchange of, parts.

Referring to, the drawings in which the same reference number refers tothe same or a similar Part:

Figure 1 is an elevational view. of a completely assembledthypodermicsyringe embodying'this invention.

Figure 2 is a top view of the plunger cap.

Figure 3 is a sectional view on line 3--3.- of Figure 2, showingattachrnent of the cap to the top of the plunger.

Figure 4. is a sideview of the top of the capped plunger.

Figure 5- is a. bottom view of, the capped plunger shown in Figure 4.

Figure 6 is a side elevational view ofthe upper portion of the syringebarrel prior to. bringing the barrel. cap into final p s n- Figure 7 isa topview of the barrel partly in section showing the barrel cap in,assembled position.

. Figure 8- is a sectional view online 8-8 of Figure/7,.

EiguresQ to 16, inclusive; illustrate a modification. of the barre pFigure, 9; isa top view of. a barrel partly in section, showingthe-modifiedbarrel cap in unlocked position.

Figure 10. is, a sectional view Qn-line 10-10-10 o.f Figure 9..

Figure ll. is similar. to Figure 9, but. shows the barrel cap in lockedposition.

Figure 12 is a bottom view OfAOIllY'. the barrel. cap: locking rinFigure 13 is a sectional, view on. line. Ill-13.- of F ura Figure 14. isa top view. of the barreLcap.

Figure. 15 is a. sectional view. on line. 15-15. of Figure..1 4.

Figure 16 is; an isometric view of the seatingring.

. Thehy odermic syringfi, asillustratedinFigure.1,, is shown without.the conventional. needle fattachmena; As Shawn. it. consists of the,two. conventibnalibasic. parts,

2,823,675 Patented Feb. s,

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namely, glass barrel 1 and glass plunger 3. Removably secured tothe. topof barrel 1 is metal barrel top 2, having a pair of finger accommodatingrings 18'. Removably assembled to the top of plunger 3 is metal plungercap 4 surmounted by finger accommodating ring 5-.

Plunger cap 4, as best shown in Figures 2 to 5; inelusive, has post 6rising from the center of its upper surface and towhich. ring 5 isfixed. Atop; the upper surface of cap 4' and surrounding the base ofpost 6 fear circular spring strip 11, fixed at one end to such uppersurface and having at its free end adepending" catch 12 free to. movevertically in a slot in the edged the upper surface.

Side wall 7 of cap 4 extends but half way around the cap on the sideopposite catch 12.. The bottom edge of side wall 7' turns inwardto formaU-shaped opening having forked ends 8 and 8a separated by awidthsuffici'ent to pass the body ofplunger 3 between them. Theseparation between the top surface of cap 4 and forks 8 and 8a issufficient to accommodate flange 9 of'plunge'r 3. Located between thetop surface of flange 9 and the adjacent under surface of cap 4 isspring disc 10" which tends to hold these surfaces apart and to resistmovement between them.

Reference to Figures 1 through 5 will indicate how plunger cap 4 isassembled to the flange of plunger. 3. By lifting catch 12 againsttheresistance of spring strip 1 1 to the broken line position shown inFigure 3, clear passage is provided for the edgewise admission of flange9 between: the top surface of cap 7 and forks 8 and 8a. The distancebetween: forks 8 and 8a will admit plunger 3 and after it has beenbrought against the resistance of disc 10 to the edge of the U-shapeclopening, catch 12 will drop' in place against the exposed edge of flange9, firmly holding plunger cap 4 to the top of plunger 3.

Barrel 1 at the top isprovided with flange 1' 3 asmay be best observed.in Figure6. Two parallel cuts in the periphery of flange 13' provide twoparallel straight sides 14 in flange. 132 Mounted immediately belowflange 13-is locking piece 15 which partially encircles and clasp'sbarrel 1. Projecting upward from locking pieces 15 are spring clips 17terminating in curved-tongues 16.

On opposite sides of barrel cap 2 are finger rings 18, preferablyintegral with cap 2. The lower portionof barrel'cap 2 terminates ininwardly tapered fingers 21', adapted to bear against the outer surfaceof the body of barrel. 1 in frictionfit engagement.

The top of barrel cap 2: is adapted to receive andhold flange 13-within' it. The top" surface of barrel" cap 2 is sized. and sh'apedtoadmit flange 1'3 when' in registry with it. Each straight side of theopening in the top surface of barrel cap 2*i's indented withnotch 19which will accommod'ate: inwardly-pressed clip 17 when flange 13 isadmitted to itsseatingi within cap 2 Stop pin 20' may be incorporated inbarrel cap 2 to limitthe movement, in assembling,zof'fiange 1'3" withrespect to cap 2', by projectinginto the'pathof: clip 17.

Between the seating ledgeof barrel: cap 2" and' the bottom of flange:13, resilient ring 22' is placed to serve as-a; cushion and spacerbetween. them.

To assemblebarrel cap 2 to barrel. 1-, locking piece -15='is firstattached, asillustrated beneath flange'13. Resilient ring 22' is. nextseated in the. top of cap 2. The lower end of barrel 1: is then insertedintothe top opening .of, barrel-cap 2' and lowered to the-positionshownwin Fig,-

ure 6. Flange13-is then-placed in registry with the-top opening of cap 2and. passed therethrough, spring clips 17: being pressedinwardly; asthey passthrough notches 19. v After. flange 13 is.seated against theresistanceof resilientrring. 22,. bar-relv 1. is twisted. to theposition shown in. Figure 7 whereby. the round portions of. flange 13--are brought under the overhang of the straight sides of the top openingof cap 2 is friction fit engagement therewith. Stop will limit thetwisting movement.

Barrel cap is removed by reversing the foregoing steps. Only when clips17 are in registry with notches 19 may the barrel be removed and thenagainst the spring catch resistance of clips 17.

The modifications in the barrel cap are shown in Figures 9 to 16,inclusive.

Certain parts remain unchanged, such as glass barrel 1 with flange 13and its straight sides 14. Also unchanged is locking piece 15 withspring clips 17 and tongues 16.

The modified barrel top consists basically of two pieces, body 27 andlocking ring 23. Body 27 has fingers 21 to grip barrel 1 and fingerrings 18 preferably integral with it.

The circular top opening of body 27 has recess 32 to accommodateresilient; ring 29, shown in Figure 16, and flange 13 of barrel 1. Ring29 has upstanding tabs 30 and is prevented from moving circularly on itsseat by a pair of slots 31 let into the inner .wall of recess 32. A 81?:provides a seat for the outer vertical edge of each ta Spaced flanges 28on the outer surface of body 27 at its top edge cooperate with spacedflanges inside of ring 23 at its bottom edge to afford means forslidably engaging ring 23 to body 27. Figures 14 and 15 illustrate body27 without ring 23.

Referring to Figures 12 and 13, ring 23 is shown by itself. The topopening of ring 23 has straight sides with notches 24 to permit flange13 and clips 17 to pass. Undercut 26 provides a track for flanges 28 ofbody 27.

The modified barrel cap once assembled is not thereafter disassembled inorder to be mounted on a barrel. It contains in recess 32, ring 29 fixedby the location of tabs 30 between a pair of slots 31, and is surmountedby partially rotatable ring 23. Ring 23, once it has been engaged withbody 27 is prevented from accidental disengagement by stop screw 33threaded into opening 34, located midway between adjacent flanges 25.Thus, the movement of ring 23 relative to body 27 is limited to the .arcbetween flanges 25.

To assemble the modified barrel cap to barrel 1, ring 23 is rotated toplace a notch 24 in registry with the opening between tabs 30 of ring29. Next, barrel 1 is lowered into the opening of ring 23 until it isseated on ring 29 and a clip 17 is lodged between tabs 30. Turning ring23 will cause it to firmly grip flange 13.

It will be noted that with the modified barrel cap the barrel remainsfixed and the rotation of ring 23 secures the barrel to the cap. In thefirst illustration given herein, it is the barrel that is rotated toplace it in secured position.

Many modifications may be made in the construction shown and described,and it is not intended by such descriptions to limit the scope of thisinvention.

What I claim is:

1. In a hypodermic syringe finger grip mounting means consisting of aplunger and cap assembly comprising a cylindrical plunger having anencircling flange at one end; a cap having a circular top coextensivewith the flanged end of the plunger; a curved side wall depending fromthe circular top for a portion of its periphery not in excess of 180degrees with its inner surface in contact with the outer edge of theplunger flange; a bottom member extending from the curved side wallparallel with the circular top and embracing a portion of the plungerflange therebetween; a spring catch on the circular top engaged with theplunger flange; and a finger grip mounted atop the circular top; and abarrel and barrel cap assembly comprising a cylindrical barrel having anexternal flange encirciing its open top; a cut-away section in suchflange; a band partially encircling the barrel beneath the flange;

4 v p l an upstanding flexible member attached to such band curved aboutthe cut-away edge of the flange a spaced distance therefrom; a capmember having a collar encompassing the barrel, band and flange; fingermembers extending downward from the collar in friction fit engagementwith the barrel; and an inwardly turned edge on top of the collarforming an opening coaxial with the barrel and substantially identicalwith the periphery of the flange and having a notch therein adapted toaccommodate passage of the upstanding flexible member; and a pair offinger grips extending from the collar on opposite sides thereof.

2. In a hypodermic syringe, a plunger and cap assembly comprising acylindrical plunger having an encircling flange at one end; a cap havinga circular top coextensive with the flanged end of the plunger; a curvedside wall depending from the circular top for a portion of its peripherynot in excess of degrees with its inner surface in contact with theouter edge of the plunger flange; a bottom member extending from thecurved side wall parallel with the circular top and embracing a portionof the plunger flange therebetween; a spring catch on the circular topengaged with the plunger flange; and a finger grip mounted atop thecircular top.

3. In a hypodermic syringe, a plunger and cap assembly comprising acylindrical plunger having an encircling flange at one end; a cap havinga circular top coextensive with the flanged end of the plunger; a curvedside wall depending from the circular top for a portion of its peripherynot in excess of 180 degrees with its inner surface in contact with theouter edge of the plunger flange; a U-shaped bottom member extendingfrom the curved side wall parallel with the circular top and embracing aportion of the plunger flange therebetween; a spring catch on thecircular top engaged with the plunger flange; and a finger grip mountedatop the circular top.

I -4. In a hypodermic syringe, a plunger and cap assembly comprising acylindrical plunger having an encircling flange at one end; a cap havinga circular top coextensive with the flanged end of the plunger; aresilient member disposed between the end of the plunger and theunderside of the circular top; a curved side wall depending from thecircular top for a portion of its periphery not in excess of 180 degreeswith its inner surface in contact with the outer edge of the plungerflange; a U-shaped bottom member extending from the curved side wallparallel with the circular top and embracing a portion of the plungerflange therebetween; a spring catch on the circular top engaged with theplunger flange edge opposite the embraced portion of the flange; and afinger grip mounted atop the circular top.

5. In a hypodermic syringe; a plunger and cap assembly comprising acylindrical plunger having an encircling flange atone end; a cap havinga circular top coextensive with the flanged end of the plunger; aresilient disc disposed between the end of the plunger and the undersideof the circular top; a curved side wall depending from the circular topfor a portion of its periphery not in excess of 180 degrees with itsinner surface in contact with the outer edge of the plunger flange; aU-shaped bottom member extending from the curved side wall parallel withthe circular top and embracing a portion of the plunger flangetherebetween; a spring catch on the circular top engaged with theplunger flange edge opposite silient disc disposed between the end ofthe plunger and the underside of the circular top; a curved side walldepending from the circular top for a portion of its periphery not inexcess of 180 degrees with its inner surface in contact with the outeredge of the plunger flange; a U-shaped bottom member extending from thecurved side wall parallel with the circular top and embracing a portionof the plunger flange therebetween; a flexible circular strip on thecircular top, secured at one end thereto and at the other end having adependent portion beyond the edge of the top and engaged with theplunger flange; and a finger grip mounted atop the circular top.

7. In a hypodermic syringe a barrel and barrel cap assembly comprising acylindrical barrel having an external flange encircling its open top; acut-away section in such flange; a band partially encircling the barrelbeneath the flange; an upstanding flexible member attached to such bandcurved about the cut-away edge of the flange a spaced distancetherefrom; a cap member having a collar encompassing the barrel, bandand flange; a pair of finger grips extending from the collar on oppositesides thereof; finger members extending down ward from the collar infriction fit engagement with the barrel; and an inwardly turned edge ontop of the collar forming an opening coaxial with the barrel andsubstantially identical with the periphery of the flange and having anotch therein adapted to accommodate passage of the upstanding flexiblemember.

8. In a hypodermic syringe a barrel and barrel cap assembly comprising acylindrical barrel having an external flange encircling its open top; acut-away section in such flange; a band partially encircling the barrelbeneath the flange; an upstanding flexible member attached to such bandcurved about the cut-away edge of the flange a spaced distancetherefrom; a cap member having a collar encompassing the barrel, bandand flange; a pair of finger grips extending from the collar on oppositesides thereof; finger members extending downward from the collar infriction fit engagement with the barrel; an inwardly turned edge on topof the collar forming an opening coaxial with the barrel andsubstantially identical with the periphery of the flange and having anotch therein adapted to accommodate passage of the upstanding flexiblemember; and a resilient ring positioned between the inner surface of thecollar and the bottom edge of the flange.

9. In a hypodermic syringe a barrel and barrel cap assembly comprising acylindrical barrel having an external flange encircling its open top; apair of cut-away sections in such flange; a band partially encirclingthe barrel beneath the flange; a pair of upstanding flexible membersattached to such band each being curved about a cut-away edge of theflange a spaced distance therefrom; a cap member having a collarencompassing the barrel, band and flange; a pair of finger gripsextending from the collar on opposite sides thereof; finger membersextending downward from the collar in friction fit engagement with thebarrel; an inwardly turned edge on top of the collar forming an openingcoaxial with the barrel and substantially identical with the peripheryof the flange and having notches therein adapted to accommodate passageof the upstanding flexible members, and a resilient ring positionedbetween the inner surface of the collar and the bottom edge of theflange.

10. In a hypodermic syringe a barrel and barrel cap assembly comprisinga cylindrical barrel having an external flange encircling its open top;a pair of cut-away sections in such flange; a band partially encirclingthe barrel beneath the flange; a pair of upstanding flexible membersattached to such band, each being curved about a cut-away edge of theflange a spaced distance therefrom; a cap member having a collarencompassing the barrel, band and flange; a pair of finger gripsextending from the collar on opposite sides thereof; finger membersextending downward from the collar in friction fit engagement with thebarrel; an inwardly turned edge on top of the collar forming an openingcoaxial with the barrel and substantially identical with the peripheryof the flange and having notches therein adapted to accommodate passageof the upstanding flexible members; a resilient ring positioned betweenthe inner surface of the collar and the bottom edge of the flange; and astop inward of the collar adapted to limit rotary movement of the barrelwith respect thereto.

11. In a hypodermic syringe a barrel and barrel cap assembly comprisinga cylindrical barrel having an external flange encircling its open top;a cut-away section in such flange; a band partially encircling thebarrel beneath the flange; an upstanding flexible member attached tosuch band curved about the cut-away edge of the flange a spaced distancetherefrom; a cap member having a collar encompassing the barrel, bandand flange; a pair of finger grips extending from the collar on oppositesides thereof; finger members extending downward from the collar infriction fit engagement with the barrel; an interrupted flange on theexternal surface of the collar adjacent its top; a ring with aninterrupted internal flange adapted to engage with the flange of thecollar; an inwardly turned edge on top of the ring forming an openingcoaxial with the barrel and substantially identical with the peripheryof the flange and having a notch therein adapted to accommodate passageof the upstanding flexible member.

12. In a hypodermic syringe a barrel and barrel cap assembly comprisinga cylindrical barrel having an external flange encircling its open top;a pair of cut-away sections in such flange; a band partially encirclingthe barrel beneath the flange; a pair of upstanding flexible membersattached to such band, each being curved about a cut-away edge of theflange a spaced distance therefrom; a cap member having a collarencompassing the barrel, band and flange; a pair of finger gripsextending from the collar on opposite sides thereof; finger membersextending downward from the collar in friction fit engagement with thebarrel; an interrupted flange on the external surface of the collaradjacent its top; a ring with an interrupted internal flange adapted toengage with the flange of the collar; an inwardly turned edge on top ofthe ring forming an opening coaxial with the barrel and substantiallyidentical with the periphery of the flange and having notches thereinadapted to accommodate passage of the upstanding flexible members; and aresilient ring positioned between the inner surface of the collar andthe bottom edge of the flange.

Creasy Nov. 17, 1931 Kohl Apr. 3, 1956

